CN106199730B - Underground Engineering Induced Polarization Advance Geological Forecast Wireless Rapid Acquisition System and Method - Google Patents

Abstract

The invention discloses a wireless rapid acquisition system for polarization advanced geological prediction in underground engineering, which includes a bracket, a non-polarized electrode is installed on one side of the bracket, and a vacuum generating module for adsorbing the bracket to the face of the tunnel is arranged on the other side; a sealing ring , set on the surface of the palm face to support the bracket; the wireless acquisition and communication module is set on the bracket, including a wireless transmission module and a data acquisition module, and the data acquisition module is connected to the non-polarized electrodes; the rapid acquisition system proposed by the present invention passes Wireless communication control switching electrodes avoids manual electrode movement, and realizes automatic control of detection electrode acquisition and transmission switching. At the same time, each electrode is collected in parallel by its own independent single-channel acquisition module, which improves the traditional sequential acquisition method and greatly shortens the acquisition time. The whole detection process of the rapid acquisition system proposed by the present invention has high speed and high efficiency, and can measure immediately in safety, and can be completed in the gaps between the construction procedures of the tunnel without affecting the normal construction.

Description

Underground Engineering Induced Polarization Advance Geological Forecast Wireless Rapid Acquisition System and Method

technical field

The invention relates to the field of excitatory polarization advanced geological prediction for tunnel and underground roadway engineering, in particular to a wireless rapid acquisition system and method for underground engineering polarization advanced geological prediction.

Background technique

With the rapid development of the national economy and the strategic needs of national construction, my country's tunnel construction projects are increasing day by day, and the construction difficulty is becoming more and more difficult. It has become the country with the largest tunnel and underground construction scale and the fastest construction speed in the world. As of the end of 2013, my country has built 11,359 road tunnels with a total length of 9,606 kilometers; my country has 11,074 railway tunnels in operation with a total length of 8,939 kilometers; around a number of world-class water conservancy projects, more than 10,000 kilometers of various hydraulic tunnels have been built.

However, in the process of tunnel construction, there are often water-bearing structures, water-guiding channels, muddy interlayers and other unfavorable geological bodies along the tunnel site area, forming disaster sources that easily lead to major disasters such as water and mud inrush. Especially as the focus of water conservancy and hydropower projects and transportation projects shifts to the western mountainous areas and karst areas with extremely complex topographic and geological conditions, most tunnel projects in my country have the characteristics of long tunnel lines, large buried depths, and complex geological environments, which make pre-construction surveys difficult. Determine the source of water and mud inrush disasters along the line. Therefore, during the construction process, the advanced detection of the position, shape, and water distribution of unfavorable geological bodies in front of the tunnel face is particularly important for the prevention, control and early warning of such accidents.

At present, the geophysical exploration methods and equipment used in tunnel construction mainly include seismic wave reflection method, electrical method and electromagnetic method. Electrical advanced geological prediction methods mainly include the mine resistivity method and the induced polarization method, and the induced polarization method has better advantages in terms of the location of the water body and the estimation of the water volume, so the induced polarization method is widely used in tunnel water inrush In the advanced detection of disaster sources, it is one of the most promising methods of advanced geological detection in tunnel engineering. At the same time, there are many problems in the process of data acquisition using the induced polarization method in the tunnel:

1) In the traditional detection process, the method of drilling holes on the face of the face is used to arrange electrodes, which requires a lot of drilling work on the face of the face, which is time-consuming and laborious;

2) A large number of detection electrodes (more than 20) arranged on the face of the face are equipped with a large number of cables, which not only occupy the space in front of the face of the face during the detection process, but also make the process of detecting and releasing wires very complicated. At the same time, a large number of Cables and electrodes are difficult to transport and carry;

3) The traditional electrode itself has a strong polarization effect, and the existing non-polarized electrode and the rock surface have a large grounding resistance, which makes it difficult to achieve excitation polarization acquisition under the condition of small grounding resistance. In addition, the measurement of the traditional electrode Running poles requires manual operation, which is inconvenient to operate and low in work efficiency.

Contents of the invention

In view of the above-mentioned problems, in order to solve the deficiencies of the existing technology, the present invention provides a polarization advanced geological forecasting system suitable for underground engineering such as tunnels, which can realize rapid installation, avoid a large number of drilling work on the face, and transmit wirelessly. Wireless fast acquisition system and method.

To achieve the above object, the present invention adopts the following technical solutions:

Underground engineering polarization advanced geological prediction wireless fast acquisition system, including:

Bracket, install non-polarized electrodes on one side of the bracket, and a vacuum generating module for absorbing the bracket to the palm surface on the other side, so that the bracket can be quickly installed on the palm surface, which is simple and convenient;

The sealing ring is set on the surface of the face to support the bracket, and the setting of the sealing ring further ensures the stable installation of the non-polarized electrode;

The wireless acquisition and communication module is set on the bracket, including the wireless transmission module and the data acquisition module, and the data acquisition module is connected with the non-polarized electrodes;

The data processing module is connected with the data acquisition module and transmits the collected information to the test host through the wireless transmission module.

The rapid acquisition system of the present invention can realize rapid installation, and is connected with the test host through a wireless transmission module, without drilling and wiring, and is easy to install.

The wireless transmission module is based on a single-chip transceiver chip, and the link layer is integrated on the module to facilitate embedded applications. Select high-speed transmission to reduce air transmission time, improve detection efficiency and reduce transmission collisions. Integrate the high-speed signal processing part, adopt the response mode communication, automatically generate the response signal and resend the lost data packet, and avoid the detection data loss caused by the communication packet loss.

The data processing module is used to control the work of each module of the collection and communication equipment. The processing module is provided with a key switch, and the wireless transmission module works when the switch is turned on. After the wireless transmission module receives the command signal from the industrial computer, it controls the acquisition module and the isolation filter module to work, and then controls the wireless transmission module to feed back the collected data to the test host.

The test host unit is composed of an upper industrial computer and a time-division multiplexing wireless transmission module. Among them, the industrial computer is equipped with proprietary acquisition software to control the issuance of instructions and the collection and storage of detection data; the time-division multiplexing wireless transmission module can realize the simultaneous transmission and reception of detection instructions and detection data.

Further, the data processing module is arranged on the surface or inside of the support, preferably on the surface of the support for easy maintenance.

Further, for the convenience of taking, the bracket is a hollow cylinder inside, because the bracket must be fixed on the face of the palm, the non-polarized electrode is embedded in the cylinder and the end protrudes from the bracket, and it is not polarized during installation. The protruding end of the chemical electrode passes through the support ring and contacts the face of the palm.

Further, the vacuum generating module is a vacuum pump, and the vacuum pump is connected to a governor, or a speed-adjustable vacuum pump is selected, and the vacuum pump is connected to a power supply, which is a dry battery and controls the action of the vacuum pump through a switch.

Further, an isolation filter module is provided between the data acquisition module and the data processing module, the data acquisition module is a single-channel electrical signal data acquisition card, and the signal acquisition module has higher precision, resolution and acquisition frequency The single-channel electrical signal data acquisition card, the data acquisition module is connected with the non-polarized electrode, and the non-polarized electrode is used as the measured unit, and the electrical signal is collected under the control of the data processing module. The collected information is converted by the AD chip and the data is cached. The instruction of the waiting processing module is sent by the wireless transmission module.

The isolation filter module is embedded in the data acquisition module, which isolates the collected signal and filters it through an eighth-order Butterworth filter to reduce noise and improve the signal-to-noise ratio.

Further, one end of the non-polarized electrode is an electrode contact end encapsulated by conductive cloth, the electrode contact end is connected to the electrode cylinder, and copper sulfate solution is stored in the electrode cylinder, and after the copper sulfate solution penetrates into the electrode contact end, a mud-like The conductive medium makes the entire electrode contact end flexible. When the installation is completed, the electrode contact end squeezed on the palm surface can deform with the uneven palm surface shape, so as to be well coupled with the palm surface; the inside of the electrode cylinder is from the bottom up A helical copper wire is fixed, and the copper wire is soaked in the copper sulfate solution, conducts electricity through ion exchange between the copper sulfate solution and the copper wire, thereby reducing the polarization potential difference and meeting the detection requirements of the induced polarization effect. The outer end of the bottom of the electrode cylinder is provided with a sleeve wire, and the copper wire is exposed at the bottom of the electrode cylinder to connect with the external cable.

Further, the material inside the electrode contact end is flake graphite.

Further, a porous ceramic material cover plate for the passage of the copper sulfate solution is provided between the electrode cylinder and the electrode contact end, and the cover plate is fixedly connected with the electrode contact end.

Further, the sealing ring is a prefabricated sealing ring based on ethanol-based guar gum, which is placed between the palm surface and the collection system during use. The material of the sealing ring is in the form of a solid gel on the wet palm surface and can be completely filled and adsorbed. The gap between the surface and the rough face, and the material of the sealing ring is a natural preparation, which will not pollute the construction environment.

The wireless rapid acquisition method for underground engineering polarization advanced geological prediction adopts the wireless rapid acquisition system, and the specific usage method is as follows:

1) Set and select multiple measuring points on the face of the underground project;

2) Place the sealing ring on the measuring point;

3) The bracket is adsorbed on the palm surface through the sealing ring through the vacuum generating module;

4) The data acquisition module is controlled by the test host to measure the electrode potential information and feed it back to the test host.

Specifically, the specific steps are as follows:

(1) The technician enters the face area of the tunnel to be detected with a wireless detection device quickly deployed, and selects the number and location of measurement points according to the actual face condition.

(2) Take the corresponding independent detection device according to the number of selected measuring points, fill the unevenness with the sealing ring on the wet face, and then press the adsorption surface of the device integration module of the quick installation device inwardly on the sealing ring of the face After turning on the power and the switch, the governor controls the work of the vacuum generating module. After the vacuum pump finishes working, the wireless quick arrangement device is quickly arranged at the designated position on the palm surface, and then the switch of the collection and communication equipment processing module is turned on to wait for the receiving and testing of the host unit. probe command. Afterwards, other rapid acquisition devices on the face of the tunnel were arranged in turn as M measuring points. In addition, a fast acquisition device is arranged in the same way at the rear side wall of the tunnel as the N measuring point.

(3) Open the detection software of the test host unit. After the tunnel side wall is powered, the transmission module of the upper computer sends acquisition instructions, and the wireless transmission module of the detection device receives the instructions in turn. The processing module controls the acquisition module to collect the potential information of the connected contact non-polarized electrode. After the collected data is processed by the isolation filter module, the data is fed back to the industrial computer and then stored by the industrial computer. The acquisition of each module is carried out synchronously, which greatly improves the detection rate.

(4) After the data collection is completed, carry out three-dimensional inversion positioning imaging for the possible unfavorable geological bodies, and obtain the three-dimensional resistivity image of the geological bodies in front of the working face through inversion and iteration on the basis of forward calculation, so as to realize the three-dimensional image of the water-bearing body position.

The beneficial effects of the present invention are:

1) The rapid acquisition system proposed by the present invention realizes the fast and convenient arrangement and reliable fixing of the measuring electrodes on the tunnel face, avoids a large number of drilling holes in the traditional detection process, and greatly shortens the detection electrode placement for the advanced prediction of the induced polarization of the tunnel time, simplifies the layout process, and improves detection efficiency.

2) The rapid acquisition system proposed by the present invention realizes the wireless transmission of commands and detection data between the host and each detection electrode, avoids the complicated arrangement of a large number of cables, and also makes the entire detection process not occupy the space in front of the entire working face.

3) The rapid acquisition system proposed by the present invention overcomes the shortcomings of the polarization of the traditional metal electrodes themselves and the relatively large grounding resistance of the existing non-polarized electrodes through the non-polarized coupling electrode and the air negative pressure squeezed on the face of the face , to realize the contact acquisition of excited polarization data.

4) The fast acquisition system proposed by the present invention controls switching electrodes through wireless communication to avoid manual pole-running, and realizes the automatic control of detection electrode acquisition and transmission switching. At the same time, each electrode is collected in parallel by an independent single-channel acquisition module, which improves the traditional Sequential collection method greatly shortens the collection time.

5) The whole detection process of the rapid acquisition system proposed by the present invention is fast and efficient, and can be measured immediately after safety, and can be completed in the gaps between the construction procedures of the tunnel without affecting the normal construction.

6) The equipment and modules of the rapid acquisition system proposed by the present invention are independent of each other, which is convenient for maintenance and will not affect the entire detection process due to problems with individual modules at the job site.

Description of drawings

Fig. 1 is a working schematic diagram of the wireless fast acquisition device of the present invention;

Fig. 2 is a schematic sectional view of the wireless fast acquisition device of the present invention;

Fig. 3 is a schematic diagram of wireless fast acquisition equipment of the present invention;

Fig. 4 is a schematic diagram of the acquisition and communication equipment of the present invention;

Fig. 5 is a schematic diagram of the contact type non-polarized electrode device of the present invention;

Among them, 1. Wireless fast acquisition device, 2. Bracket, 3. Non-polarized electrode, 4. Wireless acquisition and communication unit, 5. Mud-like conductive medium, 6. Vacuum generation module, 7. Sealing ring, 8. Power supply and Switch, 9. Vacuum pump, 10. Governor, 11. Electrical signal acquisition module, 12. Isolation filter module, 13. Wireless transmission and data processing module, 14. Single channel acquisition card, 15. Isolation module, 16. Filter module , 17. Wireless communication module, 18. Data processing module, 19. Electrode barrel, 20. Ceramic cover plate, 21. Copper sulfate solution, 22. Helical copper wire, 23. Electrode contact end, 24. Conductive cloth.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing of description and specific embodiment:

The wireless rapid acquisition system for underground engineering polarization advanced geological forecast provided by the present invention is composed of a bracket 2, a contact non-polarized electrode 3, a wireless acquisition and communication unit 4 and a test host.

As shown in Figure 2 and Figure 3, a plurality of module integrated card slots are set on the bracket 2, the contact non-polarized electrode 3, the vacuum generation module 6, the data acquisition module is the electrical signal acquisition module 11, the isolation filter module 12, the wireless Both the transmission and processing modules 13 are installed on the bracket 2 through the module integrated card slot, thus forming an independent detection device. Wherein, the vacuum generating module 6 includes a vacuum pump 9 and a governor 10. One end of the governor 10 is connected to the vacuum pump 9 to control its startup and working speed. The other end of the vacuum generating module is connected to a power supply and a switch 8. After the power button is manually turned on, the power It can provide the power consumption of the vacuum generating module 6 to work. The telecommunication acquisition module 11 included in the wireless acquisition and communication unit 4, the isolation filter module 12, and the wireless transmission and data processing module 13 are installed on the corresponding card slot of the bracket, and one end of the electrical signal acquisition module 11 is connected to the contact non-polarized electrode 3 connected to collect the electrode potential information, one end is connected to the isolation filter module 12, and the potential information collected by the single-channel acquisition card 14 in the electrical signal acquisition module 11 is denoised by the isolation module 15 and the eighth-order Butterworth filter module 16, and passed through The processed detection information is sent and received via the wireless communication module 17 under the control of the data processing module 18 , as shown in FIG. 4 .

The bracket 2 is a hollow cylindrical shell made of carbon fiber. The inner surface of the bracket 2 is provided with a connecting thread, which corresponds to the thread at the bottom of the contact non-polarized electrode 3, and is used for disassembly and assembly of the contact non-polarized electrode 3, quickly When arranged, the hollow surface of the bracket 2 is arranged facing the face of the palm.

The vacuum pump 9 is a micro-diaphragm vacuum pump, wherein the micro-diaphragm vacuum pump contains a DC motor, and the motor drives the diaphragm to reciprocate and cooperate with the opening and closing of the one-way valve to form a vacuum effect. The motor line of the vacuum pump is connected to the speed regulating potentiometer in the governor to control the startup and working speed of the vacuum pump, and the power cord of the governor is connected to the power battery.

As shown in Figure 5, one end of the non-polarized electrode is an electrode contact end 23 encapsulated by conductive cloth, the electrode contact end 23 is connected with the electrode cylinder 19, and copper sulfate solution 21 is stored in the electrode cylinder 19, copper sulfate solution 21 After penetrating into the electrode contact end 23, a mud-like conductive medium 5 is formed, so that the entire electrode contact end 23 is flexible. The faces of the poles are well coupled; the electrode cylinder 19 is fixed with a helical copper wire 22 from the bottom up, and the copper wire is soaked in the copper sulfate solution 21 .

In the actual detection process, the technicians select the arrangement position and number of detection points according to the actual tunnel face conditions, as shown in Figure 1, so as to lay out two measuring lines on the tunnel face, each Taking ten measuring points on each line as an example, twenty wireless fast acquisition devices 1 are arranged in sequence. When deploying a single wireless rapid acquisition device 1, take out the sealing ring 7 and place it at the selected measuring point. The adsorption surface of the wireless rapid acquisition device 1 faces the face of the tunnel and presses on the matted sealing ring 7 on the face of the tunnel. The sealing ring 7 After the gap between the undulating palm surface and the adsorption surface is completely filled on the wet palm surface, turn on the vacuum generator switch on the left side of the power supply and switch 8, as shown in Figure 2, the governor 10 in the vacuum generator module 6 Control the work of the vacuum pump 9 to quickly form a negative pressure in the adsorption surface. At the same time, the flexible electrode contact end 23 of the contact non-polarized electrode 3 is also pressed tightly on the palm surface and tightly coupled with it. The copper sulfate stored in the electrode cylinder 19 The solution 21 penetrates into the mud-like conductive medium 5 wrapped by the conductive cloth 24 through the porous ceramic cover plate 20, and the wireless rapid acquisition device 1 completes the rapid arrangement on the palm surface under the action of air pressure. The above wireless rapid acquisition device 1 is used as the measuring electrode M to measure point. In addition, a fast acquisition device is arranged in the same way at the rear side wall of the tunnel as the infinity acquisition electrode as the measurement electrode N measurement points.

After the layout is completed, turn on the power supply and the acquisition switch on the right side of the switch 8, as shown in Figure 2, the wireless acquisition and communication module 4 starts to work, waiting for the detection command from the test host unit. After supplying power to the side wall of the tunnel, the technician operates the detection software of the host equipment, the transmission module of the industrial computer sends a detection command, the wireless communication module 17 in the detection device 1 receives the detection command, and the data processing module 18 controls the electrical signal acquisition module 11 to collect the connected contacts. The potential information of the non-polarized electrode 3, the collected signal is buffered in the electrical signal acquisition module 11 after being denoised by the isolation filter module 12, and is transmitted back to the industrial computer by the wireless communication module 17 under the control of the data processing module 18, and the industrial computer receives The potential information of the measuring point M and the measuring point N is stored after subtracting the reference potential d from the acquisition signal V, so as to complete the data acquisition of the excitatory polarization advanced geological prediction for tunnels and other underground projects.

The above is only a preferred embodiment of the present invention, not all embodiments of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention , should be included within the protection scope of the present invention.

Except for the technical features described in the description, the rest of the technical features are known to those skilled in the art. In order to highlight the innovative features of the present invention, the above technical features will not be repeated here.

Claims (6)

1. The wireless rapid acquisition system for underground engineering polarization advanced geological prediction, characterized in that it includes: A bracket, a non-polarized electrode is installed on one side of the bracket, and a vacuum generating module for adsorbing the bracket to the palm surface is provided on the other side; The sealing ring is arranged on the surface of the palm face to support the bracket; The wireless acquisition and communication module is set on the bracket, including the wireless transmission module and the data acquisition module, and the data acquisition module is connected with the non-polarized electrodes; One end of the non-polarized electrode is an electrode contact end encapsulated by conductive cloth, the electrode contact end is connected to the electrode cylinder, and copper sulfate solution is stored in the electrode cylinder. After the copper sulfate solution penetrates into the electrode contact end, a mud-like conductive medium is formed. The entire electrode contact end is flexible; a spiral copper wire is fixed from the bottom up in the electrode cylinder, and the copper wire is soaked in the copper sulfate solution; cable connection; A data processing module, which is connected with the data acquisition module and transmits the collected information to the test host through the wireless transmission module; The bracket is a hollow cylinder inside, the non-polarized electrode is embedded in the cylinder and the end protrudes from the bracket, and a porous ceramic material cover plate for copper sulfate solution to pass is provided between the electrode cylinder and the electrode contact end ; An isolation filter module is provided between the data acquisition module and the data processing module, and the data acquisition module is a single-channel electrical signal data acquisition card; There are multiple module integrated card slots on the bracket, and the non-polarized electrodes, vacuum generator module, data acquisition module, isolation filter module, wireless transmission module and data processing module are all installed on the bracket through the module integrated card slots to form an independent detection device; One end of the data acquisition module is connected to the non-polarized electrode to collect electrode potential information, and the other end is connected to the isolation filter module. The potential information collected by the single-channel acquisition card in the data acquisition module is denoised, and the processed potential information is in the Under the control of the data processing module, send and receive operations are performed via the wireless transmission module. 2. The wireless rapid acquisition system according to claim 1, wherein the data processing module is arranged on the surface or inside of the bracket. 3. The wireless rapid acquisition system according to claim 1, wherein the vacuum generating module is a vacuum pump, and the vacuum pump is connected to a speed regulator or is a speed-regulating vacuum pump. 4. The wireless fast acquisition system according to claim 1, characterized in that the material inside the electrode contact end is flake graphite. 5. The wireless rapid acquisition system according to claim 1, wherein the sealing ring is a prefabricated sealing ring of ethanol base guar gum. 6. The wireless rapid acquisition method for underground engineering polarization advanced geological prediction, characterized in that, adopting the wireless rapid acquisition system as described in any one of claims 1-5, the specific method of use is as follows: 1) Set and select multiple measuring points on the face of the underground project; 2) Place the sealing ring on the measuring point; 3) The bracket is adsorbed on the palm surface through the sealing ring through the vacuum generating module; 4) The data acquisition module is controlled by the test host to measure the electrode potential information and feed back to the test host; Specific steps are as follows: (1) The technician enters the face area of the tunnel to be detected with a fast-deployed wireless detection device, and selects the number and location of measurement points according to the actual face condition; (2) Take the corresponding independent detection device according to the number of selected measuring points, fill the unevenness with the sealing ring on the wet face, and then press the adsorption surface of the device integration module of the quick installation device inwardly on the sealing ring of the face After turning on the power and the switch, the governor controls the work of the vacuum generating module. After the vacuum pump finishes working, the wireless quick arrangement device is quickly arranged at the designated position on the palm surface, and then the switch of the collection and communication equipment processing module is turned on to wait for the receiving and testing of the host unit. Probing instructions, and then arrange other rapid acquisition devices on the tunnel face in turn as M measuring points, and in addition, arrange a rapid acquisition device in the same way at the rear side wall of the tunnel as N measuring points; (3) Open the detection software of the test host unit. After the tunnel side wall is powered, the transmission module of the upper computer sends acquisition instructions, and the wireless transmission module of the detection device receives the instructions in turn. The processing module controls the acquisition module to collect the potential information of the connected contact non-polarized electrode. After the collected data is processed by the isolation filter module, the data is fed back to the industrial computer and then stored by the industrial computer. The acquisition of each module is carried out synchronously, which greatly improves the detection rate; (4) After the data collection is completed, carry out three-dimensional inversion positioning imaging for the possible unfavorable geological bodies, and obtain the three-dimensional resistivity image of the geological bodies in front of the working face through inversion and iteration on the basis of forward calculation, so as to realize the three-dimensional image of the water-bearing body position.